Magnet valve

ABSTRACT

A valve construction includes a cylinder having an inlet fitting at one end and an outlet fitting at an opposite secondary end and being divided internally into an inlet chamber portion adjacent the inlet end and an outlet chamber portion adjacent the outlet end. A nozzle-shaped member is disposed in the outlet chamber and urged in a direction by a washer element toward the inlet end so that its nozzle points into the inlet chamber. The nozzle member defines an interior passage which may be closed by a poppet portion of a slide valve member which, in the nonactuated position is urged by a spring toward the inlet end into a position at which it opens the passage to the nozzle member. An electromagnetic coil is provided to cause movement of the valve member which is formed as a magnetically attractable armature so that it will move downwardly with the poppet member carried thereby in accordance with the primary pressure exerted through the inlet to overcome the biasing force of the spring and to at least partially close the passage of the nozzle member. A portion of the inlet flow is divided at the nozzle member and flows around the nozzle member into an annular passage defined therearound at the outlet chamber and which is sealed by a lip shaped tacking. During the primary pressure flow conditions, a portion of the liquid will pass around the packing and exit out through the outlet wherein an excessive pressure will cause an annular flange member to move upwardly to seal the connection between the outlet and inlet passages which is formed around the nozzle member.

llnited States Patent Tetsuo Kukuminato; Aklra Ohashi, both of 684Chigusashinden, Osawa-machi, Kimitsu-gun, Chiba-ken,

[72] Inventors J p n [21 1 Appl. No. 847,874 [22] Filed Aug. 6, 1969[45] Patented July 13, 1971 [321' Priority Aug. 8, 1968 [33] Japan [31]43-55823 [54) MAGNET VALVE Primary Examiner- Robert G. NilsonAttorney-McGlew and Toren ABSTRACT: A valve construction includes acylinder having an inlet fitting at one end and an outlet fitting at anopposite secondary end and being divided internally into an inletchamber portion adjacent the inlet end and an outlet chamber portionadjacent the outlet end. A nozzle-shaped member is disposed in theoutlet chamber and urged in a direction by a washer element toward theinlet end so that its nozzle points into the inlet chamber. The nozzlemember defines an interior passage which may be closed by a poppetportion of a slide valve member which, in the nonactuated position isurged by a spring toward the inlet end into a position at which it opensthe passage to the nozzle member. An electromagnetic coil is provided tocause movement of the valve member which is formed as a magneticallyattractable armature so that it will move downwardly with the poppetmember carried thereby in accordance with the primary pressure exertedthrough the inlet to overcome the biasing force of the spring and to atleast partially close the passage of the nozzle member. A portion of theinlet flow is divided at the nozzle member and flows around the nozzlemember into an annular passage defined therearound at the outlet chamberand which is sealed by a lip shaped tacking. During the primary pressureflow conditions, a portion of the liquid will pass around the packingand exit out through the outlet wherein an excessive pressure will causean annular flange member to move upwardly to seal the connection betweenthe outlet and inlet passages which is formed around the nozzle member.

MAGNET VALVE DETAILED DESCRIPTION OF THE INVENTION This inventionrelates to a magnet valve mounted between a master cylinder and a wheelcylinder of a car, and the object of the invention is to obtain suchmagnet valve which com prises a check valve adapted to perform achecking action against a two-way valve with packing and an escape valvearrange to perform an escaping action by providing a poppet in a movableelement and which can perform the return flow throttling operation andallows the respective valves to accomplish not only their own individualfunctions but also the functions as a unitary assembly.

BRIEF DESCRIPTION OF THE DRAWING The drawings illustrate an embodimentof the present inven tion, where FIG. 1 is a longitudinal sectionalfront view of the magnet valve device according to the presentinvention, FIG. 2 is a sectional perspective view of a flange-shapedpacking patch, FIG. 3 is a sectional perspective view of a lip-shapedpacking, FIG. 4 is a perspective view of a shakeproof washer, FIG. 5 isa perspective view of a packing patch having a tubular flange, and FIG.6 is a sectional view as taken along the line A-A of FIG. 1.

In the following will be discussed an embodiment of the presentinvention with reference to the accompanying drawings.

Referring generally to the drawings, 1 denotes a case in which a magnetcoil 2 is housed. A primary side cylinder 3 and a secondary sidecylinder 4 are joined together by welding or other means, with a pipe 5having flanges at both top and bot: tom ends being interposedtherebetween, to form valve chambers 6 and 7 defining an inlet passageand an outlet passage, respectively. Said valve chamber 6 defining theinlet passage serves as a guide cylinder in which a movable element 8operated with excitation of the magnet coil 2 is slided. In the primaryside cylinder 3 is also mounted a doughnut-shaped disc 9 which doublesas a seat for the movable element. On top of this cylinder 3 isscrew-engaged coupling (A) having a flow passage 10 and provided with aninternal thread for piping connection. The movable element 8 is pressedagainst the other end face 13 of the disc 9 by a spring 12 through aretaining ring 11 fitted in an annular groove formed near the end wallof the movable element.

The inner cylindrical portion of the movable element 8 constitutes apoppet slide guiding cylinder forming an escape valve, and a poppet 15provided with an axial communication passage around the outer peripherythereof is pressed against an end face 17 of the retaining ring by meansof a spring 16 which affords an escaping force.

18 indicates an elastic rubber disc which offers a sealing action and issecured to the poppet 15 by a pin 19.

Represented by 7 is the valve chamber defining the outletpassage, inwhich a passage 20 communicating the valve chamber 6 with the valvechamber 7 is formed on an end face of the secondary side cylinder 4.There is also provided in said chamber 7' a flange-shaped packing patch22 forming a passage 21. As will also be seen, a narrowed passage 24 anda passage 25 are formed in a nozzle 23 opposed to said poppet 15, saidpassages leading into the secondary side cylinder 4.

Further, an elastic lip-shaped packing 29 is disposed in an annularspace 28 between a cylindrical portion 26 of the nozzle 23 forming thecheck valve and a cylindrical portion 27 of the valve chamber 7. Thenozzle 23 and the lip-shaped packing 29 are compressed by a doublingplate 30 through a shakeproof washer 31. At the bottom ofthe cylinder 4is screw engaged a coupling (B) provided with a thread for pipingpurpose and formed with a passage 32 which doubles as a seat for theshakeproof washer 31.

33 denotes an air-permeating resin disc serving as a filter and fittedinto the nozzle 23.

Now, discussion will be directed to the operational aspect of thepresent inventionhaving the above-described construction. When primaryhydraulic pressure is applied under a state where no electric current isfed to the magnet coil 2, fluid passes through the passage 10, thecylindrical portion 6a of the valve chamber 6 and the communicatingpassage 14 into the flow passage 17 where said fluid is divided into twoportions. One portion passes through the communicating passage 20 tobecome secondary hydraulic pressure and further passes to the flowpassage 21. The lip-shaped packing 29, as applied with back pressureforms an annular passage space between the cylindrical portion of thenozzle 23 and the cylindrical portion 27 of the valve chamber, and saidfluid passes this space and then a passage 34 into the outlet passage32. While, the other portion of fluid ramified from the communicatingpassage 14 passes the narrow passage 24, passage 25 and filter 33 tobecome secondary hydraulic pressure which is then led into the outletpassage 32 to be joined with the first-said portion therein without theprimary side flow being throttled.

Upon application of an electric current in themagnet coil 2, anelectromagnetic force is produced, causing the movable element 8 toslide together with the poppet 15 along the guiding cylinder 35 againstthe force of the spring 12, resulting in closing the narrow passage 24of the opposed nozzle 23 with the upper face 36 of the poppet 15. On theother hand, the annular space between the cylindrical portion 26 of thenozzle 23 and the cylindrical portion 27 of the valve chamber issubjected to secondary hydraulic pressure to apply force to the innerface of the lip-shaped packing 29, causing the tubular flange portion 22to be forced out outwardly to positively close the annular flow passagespace 28, so that primary hydraulic pressure is perfectly shut out, withonly secondary hydraulic pressure being retained.

It should be noted here that even if primary hydraulic pressure isreduced, as long as the force applied to the pressure receiving face 36of the poppet opposed to the nozzle 23 is not enough to exceed the forceof the spring 16, the poppet 15 is retained in position and also theannular space 28 between the cylindrical portion 23 of the nozzle andthe cylindrical portion 27 of the valve chamber remains closed by theaction of the lip-shaped packing 29, so that retension of secondaryhydraulic pressure is assured, allowing positive performance of functionof the check valve.

In case the secondary hydraulic pressure should be increased by somereason or other and consequently a force exceeding that of the spring 16should be produced on the pressure receiving face 36, the poppet 15 isautomatically pushed against the set force of the spring 16 to form aspace 38 between the end face 37 of the nozzle and the pressurereceiving face 36 to escape such extra force toward the primary side,thereby adjusting the secondary hydraulic pressure always constant.Thus, the function of an escape valve is effected by actuation of thepoppet 15 provided in the movable element 18. I

When the electric current to the magnet coil 2 is shut off, the movableelement 8 and the poppet 15 are immediately pressed together against theother end face 13, so that the. secondary hydraulic pressure passes fromthe passage 32 only through the filter 33, the passage 25 and the narrowpassage 24, thus throttling the return flow, with the flow beingsmoothly returned to the passage 10 through the primary sidecommunicating passage 14.

According to the present invention having the abovedescribedconstruction and function, the annular flow passage space 28 between thecylindrical portion 23 of the nozzle and the cylindrical portion 27 ofthe valve chamber is closed by the lip-shaped packing 29, thus assuringmaintenance of the secondary hydraulic pressure, so that even ifinternal pressure in the primary pressure side (master cylinder) islost,internal pressure in the secondary pressure side (wheel cylinder)remains in its entirety. Therefore, in case a car is stopped'halfway onan upward slope, even if the drivers foot is detached from the brakepedal, the car won t move back since pressure remains in the secondaryside. (For release of such pressure in the secondary side, means areprovided for effecting such release automatically by electric action ofclutch or other means.)

In case of sudden application of the brake, more than required amount ofpressure, say from 120 kg./cm. to 130 kg./cm., is given to both primaryand secondary sides, and such excess pressure would cause early wear ofthe packing and other related members. Therefore, according to thepresent invention, whenever the force applied to the pressure receivingface 36 exceeds the force of the spring 16, the pop pet is automaticallyforced out against the set force of the spring 16, forming a spacebetween the cylindrical portion 37 and the pressure receiving face 36 toallow fluid to escape to the primary side, thereby to control thesecondary pressure.

Further, in order to eliminate impact of the car which may be caused bysudden reduction of internal pressure in the secondary pressure side,arrangement is made such that when the electric current to the magnetcoil is shut off, the movable element 8 and the poppet 15 areimmediately pressed en bloc against the end face 13 by the spring force,allowing secondary pressure to pass from the passage 32 through thefilter 33 and the passage so as to be returned gradually little bylittle from the narrow passage 24, thereby to gently reduce thesecondary side pressure.

We claim:

1, A check valve construction comprising cylinder means defining aprimary side inlet chamber and a secondary side outlet chamber, an inletfitting defining an inlet passage connected to said primary side inletchamber, an outlet fitting defining a secondary outlet passage and beingconnected to said secondary side outlet chamber, a sleeve member movablein said inlet chamber and having an inlet opening at its one end forcommunicating with said inlet fitting inlet passage and a poppet portionmovable therewith and defining a flow passage therethrough, a nozzlemember defining a passage therethrough extending between said inletchamber and said outlet chamber and being arranged in said outletchamber in spaced location from the interior walls thereof to define anannular passage there around, an annular packing disposed in saidannular passage and having portions engageable with respective wall ofsaid nozzle member interior of said outlet chamber but being releaseabletherefrom in a direction of said outlet upon build up of pressure, saidannular passage communicating downstream of said packing with saidoutlet passage, spring means in said inlet chamberurging said sleevemember with said poppet portion in a direction away from said nozzle tofully open the passage through said nozzle, and means for moving saidsleeve member against the force of said spring means to close the nozzlepassage.

2. A valve, according to claim I, wherein said means for moving saidsleeve member comprises an electromagnetic exciting coil, said sleevemember being of a material attractible by excitation of said coil andmovable thereby.

3. A valve, according to claim 1, including a retaining ring carried bysaid sleeve member and forming an abutment for said poppet portion, aspring biasing said poppet portion into engagement with said retainingring.

4. A valve, according to claim 3, wherein said spring means acts againstsaid ring.

5. A valve, according to claim 1, including a flange shaped packingmember of annular construction overlying said annular packing, saidannular packing being of lip-shaped formation, a doubling plateextending across the interior of said cylinder means and separating saidinlet chamber from said outlet chamber, said plate having a centralpassage for the passage of said nozzle member therethrough and at leastone additional passage around said nozzle member leading into saidannular chamber having said annular packing.

6. A valve, according to claim 5, wherein said nozzle member includes asmall diameter passage portion at the end of said nozzle which projectsinto said inlet passage and which widens outwardly toward said outletpassage. D

7. A valve, according to claim 2, including a permeable dlSC disposed atthe outlet end of said passage of said nozzle member, a doubling platedisposed between said nozzle member and said outlet fitting andincluding an annular wall portion forming a seat for said annularpacking and having a plurality of openings therethrough including acentral opening communicating with the passage of said nozzle and anouter opening communicating with the annular passage containing saidannular packing.

1. A check valve construction comprising cylinder means defining aprimary side inlet chamber and a secondary side outlet chamber, an inletfitting defining an inlet passage connected to said primary side inletcHamber, an outlet fitting defining a secondary outlet passage and beingconnected to said secondary side outlet chamber, a sleeve member movablein said inlet chamber and having an inlet opening at its one end forcommunicating with said inlet fitting inlet passage and a poppet portionmovable therewith and defining a flow passage therethrough, a nozzlemember defining a passage therethrough extending between said inletchamber and said outlet chamber and being arranged in said outletchamber in spaced location from the interior walls thereof to define anannular passage there around, an annular packing disposed in saidannular passage and having portions engageable with respective wall ofsaid nozzle member interior of said outlet chamber but being releaseabletherefrom in a direction of said outlet upon build up of pressure, saidannular passage communicating downstream of said packing with saidoutlet passage, spring means in said inlet chamber urging said sleevemember with said poppet portion in a direction away from said nozzle tofully open the passage through said nozzle, and means for moving saidsleeve member against the force of said spring means to close the nozzlepassage.
 2. A valve, according to claim 1, wherein said means for movingsaid sleeve member comprises an electromagnetic exciting coil, saidsleeve member being of a material attractible by excitation of said coiland movable thereby.
 3. A valve, according to claim 1, including aretaining ring carried by said sleeve member and forming an abutment forsaid poppet portion, a spring biasing said poppet portion intoengagement with said retaining ring.
 4. A valve, according to claim 3,wherein said spring means acts against said ring.
 5. A valve, accordingto claim 1, including a flange shaped packing member of annularconstruction overlying said annular packing, said annular packing beingof lip-shaped formation, a doubling plate extending across the interiorof said cylinder means and separating said inlet chamber from saidoutlet chamber, said plate having a central passage for the passage ofsaid nozzle member therethrough and at least one additional passagearound said nozzle member leading into said annular chamber having saidannular packing.
 6. A valve, according to claim 5, wherein said nozzlemember includes a small diameter passage portion at the end of saidnozzle which projects into said inlet passage and which widens outwardlytoward said outlet passage.
 7. A valve, according to claim 2, includinga permeable disc disposed at the outlet end of said passage of saidnozzle member, a doubling plate disposed between said nozzle member andsaid outlet fitting and including an annular wall portion forming a seatfor said annular packing and having a plurality of openings therethroughincluding a central opening communicating with the passage of saidnozzle and an outer opening communicating with the annular passagecontaining said annular packing.